<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
     <style>
    #father{
        width: 800px;
        height:900px;
        background-color: aqua;
        margin: auto;
    }
        #top{
            margin-left: 5px;
            width: 790px;
            height: 80px;
            background-color: red;
        }
        #left{
            width: 200px;
            height: 800px;
            background-color: salmon;
            margin-left: 5px;
            margin-top: 5px;
            float: left;
        }
        #right{
            margin-top: 5px;
            margin-left: 5px;
            width: 585px;
            height: 800px;
            background-color: seagreen;
            float: left;
        }
     </style>
</head>
<body>

        <div id="father">
            <div id="top"></div>
            <div id="left"></div>
            <div id="right"></div>
        </div>
     

</body>
</html>